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296 lines
16 KiB
296 lines
16 KiB
/**
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* Author......: See docs/credits.txt
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* License.....: MIT
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*/
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/*
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* Implements cracking of a password-protected mega.nz link
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* The algorithm is described at https://github.com/meganz/webclient/blob/4790e52b1eb1856a47e60b52615ffc58242c2d1c/js/ui/export.js#L1
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* The module expects the link tag as an input (everything starting with P!)
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*/
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#include "common.h"
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#include "types.h"
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#include "modules.h"
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#include "bitops.h"
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#include "convert.h"
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#include "shared.h"
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static const u32 ATTACK_EXEC = ATTACK_EXEC_OUTSIDE_KERNEL;
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static const u32 DGST_POS0 = 0;
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static const u32 DGST_POS1 = 1;
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static const u32 DGST_POS2 = 2;
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static const u32 DGST_POS3 = 3;
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static const u32 DGST_SIZE = DGST_SIZE_4_8;
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// TODO: not sure about this choice
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static const u32 HASH_CATEGORY = HASH_CATEGORY_APPLICATION_DATABASE;
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static const char *HASH_NAME = "mega.nz password-protected link (PBKDF2-HMAC-SHA512)";
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static const u64 KERN_TYPE = 33400;
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static const u32 OPTI_TYPE = OPTI_TYPE_ZERO_BYTE
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| OPTI_TYPE_USES_BITS_64
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| OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
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static const u64 OPTS_TYPE = OPTS_TYPE_STOCK_MODULE
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| OPTS_TYPE_PT_GENERATE_LE
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| OPTS_TYPE_MP_MULTI_DISABLE;
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static const u32 SALT_TYPE = SALT_TYPE_EMBEDDED;
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// A fake link generated by the same algorithm. It has a dummy public id (ffffffffffff) and a dummy encrypted key (ffffffffffffffffffffffffffffffff), but the seed is properly random and HMAC is valid.
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static const char *ST_PASS = "hashcat";
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static const char *ST_HASH = "P!AgD________U2XVjJi1vxkJgMPf5rkQYUn1H_6WI_sKtiic69mqBKP_____________________O_PDG0Om7BSapL1QoRAgUrz9vzaZmrYnU8t-Au6hteg";
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u32 module_attack_exec (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ATTACK_EXEC; }
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u32 module_dgst_pos0 (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS0; }
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u32 module_dgst_pos1 (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS1; }
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u32 module_dgst_pos2 (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS2; }
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u32 module_dgst_pos3 (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS3; }
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u32 module_dgst_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_SIZE; }
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u32 module_hash_category (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_CATEGORY; }
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const char *module_hash_name (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_NAME; }
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u64 module_kern_type (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return KERN_TYPE; }
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u32 module_opti_type (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTI_TYPE; }
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u64 module_opts_type (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTS_TYPE; }
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u32 module_salt_type (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return SALT_TYPE; }
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const char *module_st_hash (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_HASH; }
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const char *module_st_pass (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_PASS; }
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typedef struct mega_tmp
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{
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u64 ipad[8];
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u64 opad[8];
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u64 dgst[24];
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u64 out [24];
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} mega_tmp_t;
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typedef struct mega
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{
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// data that is HMACed, padded with zeroes to the next 16-byte boundary
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// (because the GPU implementation of HMAC-SHA256 requires that)
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u32 hmacced_len;
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u32 data[80];
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} mega_t;
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u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
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{
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const u64 esalt_size = (const u64) sizeof (mega_t);
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return esalt_size;
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}
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u64 module_tmp_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
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{
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const u64 tmp_size = (const u64) sizeof (mega_tmp_t);
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return tmp_size;
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}
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u32 module_pw_max (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
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{
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// this overrides the reductions of PW_MAX in case optimized kernel is selected
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// IOW, even in optimized kernel mode it supports length 256
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const u32 pw_max = PW_MAX;
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return pw_max;
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}
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int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED void *digest_buf, MAYBE_UNUSED salt_t *salt, MAYBE_UNUSED void *esalt_buf, MAYBE_UNUSED void *hook_salt_buf, MAYBE_UNUSED hashinfo_t *hash_info, const char *line_buf, MAYBE_UNUSED const int line_len)
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{
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u32 *digest = (u32 *) digest_buf;
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mega_t *mega = (mega_t *) esalt_buf;
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if (line_buf[0] != 'P' || line_buf[1] != '!') return (PARSER_SIGNATURE_UNMATCHED);
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// the base64-decoded data after the P! is either 88 or 104 bytes, depending on whether it is a folder or a file link
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u8 decoded_buf[0x100];
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if (line_len > 140) return (PARSER_GLOBAL_LENGTH);
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const size_t base64_decode_len = base64_decode (base64url_to_int, (u8 *)line_buf + 2, line_len - 2, decoded_buf);
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/*
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* An extract from the mega.nz source code:
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*
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* In constructing the protected link, the format is as follows:
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* algorithm || file/folder || public handle || salt || encrypted key || MAC tag
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*
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* algorithm = 1 byte - A byte to identify which algorithm was used (for future upgradability), initially is set to 0
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* file/folder = 1 byte - A byte to identify if the link is a file or folder link (0 = folder, 1 = file)
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* public handle = 6 bytes - The public folder/file handle
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* salt = 32 bytes - A 256 bit randomly generated salt
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* encrypted key = 16 or 32 bytes - The encrypted actual folder or file key (folder key is 16 bytes, file key is 32 bytes)
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* MAC tag = 32 bytes - The MAC of all the previous data to ensure integrity of the link i.e. calculated as:
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* HMAC-SHA256(MAC key, (algorithm || file/folder || public handle || salt || encrypted key))
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*/
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if (base64_decode_len < 88) return (PARSER_GLOBAL_LENGTH);
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// this is the "algorithm" field
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// we only support version 2 for now
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if (decoded_buf[0] != 2) return (PARSER_SALT_VALUE);
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// this is the "file/folder" field
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if (decoded_buf[1] != 0 && decoded_buf[1] != 1) return (PARSER_SALT_VALUE);
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const size_t expected_len = 1 + 1 + 6 + 32 + (decoded_buf[1] == 0 ? 16 : 32) + 32;
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if (base64_decode_len != expected_len) return (PARSER_GLOBAL_LENGTH);
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salt->salt_iter = 100000 - 1;
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// salt
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const u8 *salt_pos = decoded_buf + 8;
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memcpy(salt->salt_buf, salt_pos, 32);
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salt->salt_buf[0] = byte_swap_32 (salt->salt_buf[0]);
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salt->salt_buf[1] = byte_swap_32 (salt->salt_buf[1]);
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salt->salt_buf[2] = byte_swap_32 (salt->salt_buf[2]);
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salt->salt_buf[3] = byte_swap_32 (salt->salt_buf[3]);
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salt->salt_buf[4] = byte_swap_32 (salt->salt_buf[4]);
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salt->salt_buf[5] = byte_swap_32 (salt->salt_buf[5]);
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salt->salt_buf[6] = byte_swap_32 (salt->salt_buf[6]);
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salt->salt_buf[7] = byte_swap_32 (salt->salt_buf[7]);
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salt->salt_len = 32;
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// digest (mac tag)
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const u8 *mac_pos = decoded_buf + 8 + 32 + (decoded_buf[1] == 0 ? 16 : 32);
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memcpy(digest, mac_pos, 32);
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digest[0] = byte_swap_32 (digest[0]);
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digest[1] = byte_swap_32 (digest[1]);
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digest[2] = byte_swap_32 (digest[2]);
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digest[3] = byte_swap_32 (digest[3]);
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digest[4] = byte_swap_32 (digest[4]);
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digest[5] = byte_swap_32 (digest[5]);
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digest[6] = byte_swap_32 (digest[6]);
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digest[7] = byte_swap_32 (digest[7]);
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// data
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// all the data except hmac is hmacced
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// this is how we determine that the password is correct
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const u32 hmacced_len = 1 + 1 + 6 + 32 + (decoded_buf[1] == 0 ? 16 : 32);
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// hmacced data, padded with zeroes to the next 16-byte boundary
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memset(mega->data, 0, sizeof(mega->data));
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memcpy(mega->data, decoded_buf, hmacced_len);
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mega->hmacced_len = hmacced_len;
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for (size_t i = 0; i < hmacced_len / 4; i++)
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{
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mega->data[i] = byte_swap_32 (mega->data[i]);
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}
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return (PARSER_OK);
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}
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int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info, char *line_buf, MAYBE_UNUSED const int line_size)
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{
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const mega_t *mega = (const mega_t *) esalt_buf;
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const size_t hmacced_len = mega->hmacced_len;
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const size_t data_len = hmacced_len + 32;
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u32 unswap_buffer [104];
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for (size_t i = 0; i < hmacced_len / 4; i++)
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{
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unswap_buffer[i] = mega->data[i];
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}
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// the "data" does not include the HMAC tag, it is stored in the digest
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// copy it over
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memcpy(unswap_buffer + hmacced_len / 4, digest_buf, 32);
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// swap the bytes back
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for (size_t i = 0; i < data_len / 4; i++)
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{
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unswap_buffer[i] = byte_swap_32 (unswap_buffer[i]);
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}
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char base64_buf [0x100];
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size_t base64_len = base64_encode(int_to_base64url, (const u8 *) unswap_buffer, data_len, (u8 *)base64_buf);
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// trim the base64 padding
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while (base64_len > 0 && base64_buf[base64_len - 1] == '=') {
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base64_buf[base64_len - 1] = '\0';
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base64_len--;
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}
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const int line_len = snprintf (line_buf, line_size, "P!%s", base64_buf);
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return line_len;
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}
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void module_init (module_ctx_t *module_ctx)
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{
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module_ctx->module_context_size = MODULE_CONTEXT_SIZE_CURRENT;
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module_ctx->module_interface_version = MODULE_INTERFACE_VERSION_CURRENT;
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module_ctx->module_attack_exec = module_attack_exec;
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module_ctx->module_benchmark_esalt = MODULE_DEFAULT;
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module_ctx->module_benchmark_hook_salt = MODULE_DEFAULT;
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module_ctx->module_benchmark_mask = MODULE_DEFAULT;
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module_ctx->module_benchmark_charset = MODULE_DEFAULT;
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module_ctx->module_benchmark_salt = MODULE_DEFAULT;
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module_ctx->module_build_plain_postprocess = MODULE_DEFAULT;
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module_ctx->module_deep_comp_kernel = MODULE_DEFAULT;
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module_ctx->module_deprecated_notice = MODULE_DEFAULT;
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module_ctx->module_dgst_pos0 = module_dgst_pos0;
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module_ctx->module_dgst_pos1 = module_dgst_pos1;
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module_ctx->module_dgst_pos2 = module_dgst_pos2;
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module_ctx->module_dgst_pos3 = module_dgst_pos3;
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module_ctx->module_dgst_size = module_dgst_size;
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module_ctx->module_dictstat_disable = MODULE_DEFAULT;
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module_ctx->module_esalt_size = module_esalt_size;
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module_ctx->module_extra_buffer_size = MODULE_DEFAULT;
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module_ctx->module_extra_tmp_size = MODULE_DEFAULT;
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module_ctx->module_extra_tuningdb_block = MODULE_DEFAULT;
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module_ctx->module_forced_outfile_format = MODULE_DEFAULT;
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module_ctx->module_hash_binary_count = MODULE_DEFAULT;
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module_ctx->module_hash_binary_parse = MODULE_DEFAULT;
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module_ctx->module_hash_binary_save = MODULE_DEFAULT;
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module_ctx->module_hash_decode_postprocess = MODULE_DEFAULT;
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module_ctx->module_hash_decode_potfile = MODULE_DEFAULT;
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module_ctx->module_hash_decode_zero_hash = MODULE_DEFAULT;
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module_ctx->module_hash_decode = module_hash_decode;
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module_ctx->module_hash_encode_status = MODULE_DEFAULT;
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module_ctx->module_hash_encode_potfile = MODULE_DEFAULT;
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module_ctx->module_hash_encode = module_hash_encode;
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module_ctx->module_hash_init_selftest = MODULE_DEFAULT;
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module_ctx->module_hash_mode = MODULE_DEFAULT;
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module_ctx->module_hash_category = module_hash_category;
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module_ctx->module_hash_name = module_hash_name;
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module_ctx->module_hashes_count_min = MODULE_DEFAULT;
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module_ctx->module_hashes_count_max = MODULE_DEFAULT;
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module_ctx->module_hlfmt_disable = MODULE_DEFAULT;
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module_ctx->module_hook_extra_param_size = MODULE_DEFAULT;
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module_ctx->module_hook_extra_param_init = MODULE_DEFAULT;
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module_ctx->module_hook_extra_param_term = MODULE_DEFAULT;
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module_ctx->module_hook12 = MODULE_DEFAULT;
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module_ctx->module_hook23 = MODULE_DEFAULT;
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module_ctx->module_hook_salt_size = MODULE_DEFAULT;
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module_ctx->module_hook_size = MODULE_DEFAULT;
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module_ctx->module_jit_build_options = MODULE_DEFAULT;
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module_ctx->module_jit_cache_disable = MODULE_DEFAULT;
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module_ctx->module_kernel_accel_max = MODULE_DEFAULT;
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module_ctx->module_kernel_accel_min = MODULE_DEFAULT;
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module_ctx->module_kernel_loops_max = MODULE_DEFAULT;
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module_ctx->module_kernel_loops_min = MODULE_DEFAULT;
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module_ctx->module_kernel_threads_max = MODULE_DEFAULT;
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module_ctx->module_kernel_threads_min = MODULE_DEFAULT;
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module_ctx->module_kern_type = module_kern_type;
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module_ctx->module_kern_type_dynamic = MODULE_DEFAULT;
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module_ctx->module_opti_type = module_opti_type;
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module_ctx->module_opts_type = module_opts_type;
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module_ctx->module_outfile_check_disable = MODULE_DEFAULT;
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module_ctx->module_outfile_check_nocomp = MODULE_DEFAULT;
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module_ctx->module_potfile_custom_check = MODULE_DEFAULT;
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module_ctx->module_potfile_disable = MODULE_DEFAULT;
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module_ctx->module_potfile_keep_all_hashes = MODULE_DEFAULT;
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module_ctx->module_pwdump_column = MODULE_DEFAULT;
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module_ctx->module_pw_max = module_pw_max;
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module_ctx->module_pw_min = MODULE_DEFAULT;
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module_ctx->module_salt_max = MODULE_DEFAULT;
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module_ctx->module_salt_min = MODULE_DEFAULT;
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module_ctx->module_salt_type = module_salt_type;
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module_ctx->module_separator = MODULE_DEFAULT;
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module_ctx->module_st_hash = module_st_hash;
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module_ctx->module_st_pass = module_st_pass;
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module_ctx->module_tmp_size = module_tmp_size;
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module_ctx->module_unstable_warning = MODULE_DEFAULT;
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module_ctx->module_warmup_disable = MODULE_DEFAULT;
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}
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